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Other Assets - Summary of Other Assets (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]    
Income tax receivable $ 9,474  
Prepaid expenses 2,806 $ 2,561
Card payments receivable 2,005 725
Credit insurance receivable 1,024 436
Repossessed assets 431 502
Other 272 558
Total $ 16,012 $ 4,782